Abstract
Purpose
Adherence to endocrine therapy for hormone positive breast cancer is a significant problem, especially in minority populations. Further, endocrine therapy reduces recurrence and thus mortality. However, little data are available on interventions to improve adherence. The authors conducted a systematic review to examine the impact of interventions, strategies, or approaches aimed to improve endocrine therapy adherence among women with breast cancer. A secondary aim was to determine if interventions had any cultural modifications.
Methods
Two of the authors examined articles published between 2006 and 2017 from a wide variety of databases using Covidence systematic review platform.
Results
In total, 16 eligible studies met criteria for review including 4 randomized controlled trials, 4 retrospective studies, and 8 with various observational designs. Eligible studies used a broad range of definitions for adherence and measured adherence by self-report, medical records, claims data, and combinations of these. All used 80% medication possession ratio as a standard for adherence. Patient information/education was the most frequent intervention strategy but did not demonstrate a significant effect except in one study. Significant results were noted when education was combined with communication strategies.
Conclusions
Researchers need a standard definition for adherence and a reliable measure that is feasible to use in a variety of studies. While education may be a necessary component of an intervention, when used alone, it is not a sufficient approach to change behavior.
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Funding
Dr. Felder was supported by a Mentored Research Scientist Development Award to promote diversity from the National Cancer Institute of the National Institutes of Health (K01CA193667). Parker was supported by a training Grant from the Susan G. Komen® Foundation (GTDR17500160). Babatunde was supported by grant # 1F99CA22272201 from the National Cancer Institute. Heiney received partial funding for this paper from and ASPIRE grant from the Vice President of Research Office, University of South Carolina.
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SH: Conceptualization and plan for this review, completed the article screening, selection, and data extraction; assisted with data synthesis and contributed to the manuscript preparation. TF: Conceptualization and plan for this review; assisted with data synthesis and contributed to the manuscript preparation. PP: Contributed to the conceptualization and plan for this review, completed the article screening, selection and data extraction; assisted with data synthesis and contributed to the manuscript preparation. OO: Completed the article screening, selection, and data extraction; assisted with data synthesis and contributed to the manuscript preparation. SA: Assisted with data synthesis and contributed to the manuscript. JH: Assisted with review and editing of the manuscript.
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Heiney, S.P., Parker, P.D., Felder, T.M. et al. A systematic review of interventions to improve adherence to endocrine therapy. Breast Cancer Res Treat 173, 499–510 (2019). https://doi.org/10.1007/s10549-018-5012-7
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DOI: https://doi.org/10.1007/s10549-018-5012-7